Should someone who already has suicidal thoughts & attempted several times use chantix? wellbutrin (bupropion) didn't work to quit smoking.

There is BLACK BOX: There is a BLACK BOX WARNING by the FDA on the increased risk of suicidality while taking & after stopping Chantix. The person you refer to in the question then, should speak with their psychiatrist on the benefits of quitting smoking using Chantix vs. the risks of what the warning box says. It is then, their decision to use or not. If smoking cessation is the goal there are other methods.